Steam-boiler.



AVAILABLE COPY 1 E. w. M cCANNA. STEAM BOILER.

(Application filed Mar. 22,1902

Patented July 29, m2. v

Nrrnn STATES STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 705,779, dated July 29, 1902.

Application filed March 22, 1902. Serial No. 99,523. (No model.)

.Ta @513 whom it may concern.-

Be it known that I, EDWARD W. MCCANNA, acitizen of the UnitedStates, residing at Anaconda, in the county of Deerlodge and State of Montana, have invented a certain new and useful Improvement in Steam Boilers, of which the following is a full, clear, and exact description. Y

A main object of this invention is to provide atubular steam-boiler composed largely or wholly of commercial shapes and that may be readily transported and set up in mountainous regions with little or no regular boilershop work. i t

In carrying out my invention I prefer to use top and bottom headers of serpentine form, each composed of sections of steel tubing united by return-bends of castosteel, to which they are calked and riveted,the headers being connected to each other by regular rolled-steel boiler-tubes expanded in any ordinary way into the headers, and a steamdrum connected with thetop header by steel nozhles. The bends are provided with hand hole plates,- and the ends of the headers are provided. with manhole'plates; I prefer also to use a setting having a downdraft, so that the products of combustion will pass between the headers and about their connecting-tubes and then out beneath the bottom header, all as I will proceed now more particularly to set forth and finally claim.

In the accompanying drawings, illustrating my invention,

in the several iigures'of which like parts. are similarly designated, Figure 1 is a side elevation and partial section of the boiler arranged in a downdraft-setting, which is shown in vertical longitudinal section. Fig. 2 is vertical cross-section taken substan:

tially in the plane'of line A B, Fig. 1. Fig,

3-is a plan view illustrating the The top' and bottom headers are of like construction, excepting as hereinafter-specified i and so far as they are alike a. description 0% one will suffice lorboth. The pipes a may be of rolled steel or other commercial form and any size, and they are connected in serpentine form bycaststeel return-bends b, said pipes and return-bends being united by cal-king and riveting. The bends are su i plied with hand-hole plates e and the on s with manhole-plates c of approved construe -to the chimney or stuck, ucts of combustion circulate beneath the top header, above the bottom lower-header.

tion. The bottom header is provided with the water-intake d, also of approved construction.- The top and bottom headers are set staggering, and hence their connectingtubes e are inclined forwardly, as shown in Fig. 1, in orderthe better-to utilize the products of combustion. Th'ese tubes e are preferably commercial rolled-steel boiler-tubes, arranged in pairs and expanded into the header-. tubes 0. in any ordinary manner. The steamdrum f is mounted above the top header and connected therewith by steel nozzles g. Said drum is provided with acast-steel elbow f at one end, which 'may receive the safety valve, and the other end may have a crownvalve f 'applied to it. Flange-joints may be used for connecting these parts, substantially" as shown.

The boiler is setiu masonry, having a grate .h and a horizontal partition 0, in' which the bottom header is embedded and which is about on a'level with the grate, while the to header is in the upper wall of the setting.- he rear wall j of the setting extends beyond the boiler and forms a chamber 7c, communiating with or constituting a part of the combustionchamber Z and opening into the outlet-flue m beneath the bottom header, which flue in turn opens intothe smoke-conduits, leading so that the prodtubes e, and thence beneath the bottom header to the escape.- l a 1 Since the b1ow-'outs,' valves, gages, and other adjuncts of a boiler arenot of the novel features of the invention, I omit them from this specification.

The feed-water is introduced into thebottcmheader and circulates freely up and down the tubes; connecting the top and bot- .tom headers, and from front to rear in the top bottom header.

and from rear to front in the As already stated, the tubes are to be the regular rolledxeteel boiler tubes and expanded into the headers in the usual way, of insert-' header, around the i'ng tubes in tubular boilers.- Cast-steel retu'rn bends are used because of their strength and the ease and low cost withwhich they can be made.

boilerfsh'op worlt by manufacturers of steel The boiler thus can be built very cheaplyand without any of the regular tubing, "and all its membersibeing' comparatively small and light .theyfcan-betransported easily through mountainous regions and assembled in' the field.

. While I prefer tense the downdraft, do

} notlim'it my invention thereto.

of commercial pipes and cast-steel returnbends calked and, riveted to said. pipes,.and steel upright tubes expanded ipto'saidpipes, substantially as described.

4 3. A steam-boiler, composed of top and bottom headers of serpentine form, constructed "of commercial pipes'and cast-steel returnbends calked and riveted to said pipes; and

steel upright tubes expanded into saith-pipes, Y combined with a'ste am drum and steeljnoz- 4. A steam-boiler, composed of top and bottom headers of serpentine form, constructed of commercial pipes, and cast-steel returnbends calked and riveted to said pipes, and

- steel v upright tubes expanded into said pipes,

,combined with 'a setting having a downdraft includingia horizontal partition in whichthe, bottom header isarranged. 1 v

5. In a steam-boiler, a serpentine header, composed 0f pipes with caststeelreturnbends having hand-hole plates, andmanholeplates at the ends of the'header, substantially as described. v

In testimony whereof I have hereunto set ,my hand this'15th day 'o-f'March; A. D. 1902.

-' EDWARD .W' MeCANNA.

tnesses: MADGE, I

3 W. A. .T-AYLORf 

